Heat exchange device



1933- o. PEDERSEN 1,922,173

HEAT EXCHANGE DEVICE Filed 001;. 28, 1932 VENTOR ATTORNEY S Patented Aug 15,1933

UNITED STATES PATENT oerce V 1.922.173 HEAT EXCHANGE DEVICE Olaf SrPedeisen, East Orange, .1. Application ctober28, 1932. Serial N0. 639,949 6 Claims. (01. 257-236) This invention relates to heat exchange devices and more especially to, such devices consisting of a series of tubes surrounded by a shell provided with. headers communicating with the tubes.

In such devices, linear expansion and contraction of the tubes must be provided for so that stresses in the tubes will not be effective to rupture joints and permit .intermingling of the two fluids brought into heat exchange relationship in thedevices. Usually one tube head is made slidable and apacked joint is provided between the slidable tube head and the shell to permit expansion and contraction of the tubes and still prevent leakage of one fluid into the other.

Means usually are provided so that in case of failure of the packed joint there can be no intermingling of the two fluids which as in the case of fuel oil heated by steam would render the oil useless as fuel. Such devices have been complicated in structure, expensive to manufacture and diflicult to keep in proper operating order.

An object of this invention is a freely expansible and contractible tube-type heat exchange device having no packed joints separating the two fluids between heat exchange relation and having permanent joints permitting free movement of one tube head.

In a heat exchange device constructed in accordance with the invention, a flexible apron has one edge permanentlyjoined to the surrounding shell and the other edge permanently joined to the floatingtube head. Preferably, the apron is composed of the same material as the tubes. thereby having the same coefficient of expansion. The apron may be connected to the floating tube head and to the shell in any permanent manner to insure a fluid-tight joint and preferably is welded at the joints. The flexibility of the apron permits free movement of the floating head by reason of contraction and expansion of the tubes and fluid-tight connection is maintained at all I 5 mounted in a floating metal tube head ,13. A

metal flexible cylindrical apron 14 is permanently joined at one edge to the periphery of the tube head '13 and at its other edge to 'theshell 10 at 15, the'apron preferably being welded both to the tube head 13 and the shell ll) to form perma- G9 nent fluid-tight joints. Preferably, the apron 14 is of the same metal as the tubes 12 so that both have the same coefflcient of expansion. A metal header 16 is connected to the shell 10 at the end having fixed tube head 11 and a metal header 17 is connected to the shell 10 at the end having the floating tube head 13, the tube head 13 being received in the header 17. The headers 16 and 17 are provided with ports 18 by means of which fluid may be supplied to and discharged from the 0 tubes 12. The shell 10 is provided with ports 19 by means of which fluid may be circulated through the shell around the tubes 12. The arrangement above described obviates packed joints k separating the two fluids while permitting free expension and contraction of the tubes 12 upon change of temperature. The apron 14 preferably is provided with one or more peripheral crimps "which permit free limited movement of the floating head 13 and prevents the development of 0 of packing as there is no packing utilized.

sion and contraction of the pipes of the tubes 12 and in all conditions a fluid-tight joint is provided, thereby preventing leakage of steam into the oil.

It is of course understood that various modifications may be made in the device above described, without in any way departing from the spirit of the invention as defined in the appended claims.

I claim:

1. A heat exchange device comprising a tubular shell, a plurality of tubes extending longitudinally of the shell, a fixed tube head closing one end'of the shell, a floating tube head, a flexible cylindrical apron permanently joinedto the floating head and to the corresponding end of said shell, and headers connected to the ends of said shell and communicating with said tubes.

2. A heat exchange device comprising a shell, a plurality of tubes extending longitudinally of said shell, and projecting beyond one end thereof, a fixed tube head closing one end of said shell, a floating tube head, a flexible cylindrical apron permanently connected to the floating tube head and corresponding end of the shell, and headers connected to the ends of said shell and communicating with said tubes, one of said headers having the floating tube head and cylindrical apron arranged therein. y

3. A heat exchange device comprising a metal shell, a plurality of metal tubes extending longitudinally thereof, a tube head integral with and closing one end of said shell, a floating metal tube head, a flexible cylindrical metal apron welded to the floating tube head and the corresponding end of said shell, and headers connected to the ends of saic shell and communicating with said tubes.

4. A heat exchange device comprising a metal shell, a plurality of metal tubes extending longitudinally thereof, a tube head integral With and closing one end of said shell, a floating metal tube head, a flexible cylindrical metal apron Welded to the floating tube head and the corresponding end of said shell, said apron being composed of the same metal as said tubes, and headers connected to the ends of said shell and communicating with said tubes.

5. A heat exchange device comprising a metal shell, a plurality of metal tubes extending longitudinally of said shell and projecting beyond one end thereof, a tube head integral with said shell and closing one end thereof, a floating metal tube head, a flexible cylindrical metal apron welded to the floating tube head and the corresponding end of said shell, and headers connected to the ends of said shell and communicating with said tubes, the floating tube head and flexible apron being arranged within one of said headers.

6. A heat exchange device comprising a metal shell, a plurality of metal tubes extending longitudinallyof said shell and projecting beyond one end thereof, a tube head integral with said shell and closing one end thereof, a floating metal tube head, a flexible cylindrical metal apron Welded to the floating tube head and the corresponding end of said shell, said cylindrical apron being coinpcsed of the same material as said tubes, and headers connected to the ends of said shell and communicating with said tubes, the floating tube head and flexible apron being arranged within one of said headers.

OLAF S. PEDERSEN. 

